grapher again

[Brandon R. Brown(summer student-90) <brandon@ptolemy.arc.nasa.gov>]

Once again, there is a "grapher" that appears as an example in macl 1.3 and
it has access to the information that it graphs.  I know that it uses "getf"
to obtain the relevant info, but I still have no idea from WHERE this info is
obtained.  
I have read the documentation concerning object lisp and feel comfortable with
it.  According to my understanding of the "grapher" code, it has nothing loaded
in particular from which it can get the nodes that it graphs.  Perhaps I am not
fully understanding the "getf" function.  In my opinion, it is not well
documented.  Can someone PLEASE shed a ray of light on this for me?
Thanks in advance,
			-brandon